Telephone-transmitter



(No Model.) Q 2 Sheath-Sheet 1. J. W. BONTA.

TELEPHONE TRANSMITTER. .No. 365,779. Patented J-uly 5, l88'7.

I I Zing, 22:5:

W] T NESSES wag/M INVE/V TOR,

/ ATTORNEY Ilnrrnn STATES,

JAMES \V. BONTA, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO THE AMERICANNATIONAL TELEPHONE COMPANY, OF NEW YORK.

TELEPHONE-TRANSMITTER.

SPECIFICATION forming part of Letters Patent No. 365,779, dated July 5,1887. Application filed December 21, 1856. Serial No. 222,182. (Nomodel.)

To all whom, it may concern.-

Be it known that I, JAMES WV. BONIA, a citizen of the United States,residing at Philadelphia, in the county of Philadelphia and State ofPennsylvania, have invented certain new and useful Improvements inTelephonic Transmitters, of which the following is a specification.

My invention has relation to that form of [O telephonic transmittershaving multiple contacts or pairs of electrodes having separateinductoriums and separate batteries for the primaries of the inductoriums, the secondaries of which are all in circuit with the line; and

1 it has for its object the construction and arrangement of the parts ofthe transmitter to secure an effective and durable instrument.

My invention accordingly consists of the combination, construction, andarrangement of parts, as hereinafter described and claimed, havingreference particularly to a diaphragm in contact with a plate or diskupon which is arranged a group of segmental electrodes, each of which isin contact with two electrodes in 2 eluded in a separatebattery-circuit, which also includes the primary of a separateinductorium, the secondary of which forms part of a line-circuit commonto all the secondaries of the separate inductoriums, to spring-pressuredevices for maintaining the plate or disk in contact with the diaphragm,and separate spring-pressure devices for each one of the two electrodescontacting with the segmental electrodes for varying and maintaining theinitial 3 5 contact between the same.

' Reference being had to the annexed drawi ngs,which show a transmitterembodying my improvements, Figures 1 and 3 are vertical sections; andFig. 2 is a diagram of electrodes 0 and preferable arrangement of sameand circuit-connections.

A represents a transmitter-casing having a removable cap or cover, a,provided with mouth-piece a and diaphragm B, which may be hinged to thecap a, as indicated at b, Fig.

1, or be affixed thereto in the usual manner, as illustrated in Fig. 3.Back of the diaphragm is a disk, 0, of non-conducting material, havingon its front side a central pin or stud for 0 contact with thediaphragm, and on its rear side an annularly-arranged series ofsegmentally-configured electrodes, 0'. The disk 0 is provided withspring d and tension-screw d, suitably arranged to press the disk towardthe diaphragm B. 5

E represents electrodes for contact with the segmental electrodes 0,which electrodes E have right-angled arms 6, pivoted to bars F, securedto casing A, and are provided with springs G for keeping them in contactwith the segmental electrodes 0. The action of springs G G and spring (Zis toward the diaphragm, the former maintaining contact between theelectrodes E c, and the latter keep ing the disk 0 in contact with thediaphragm. By adjusting tension-screw d the contact between theelectrodes may be varied, as desired.

. Each electrode E may contact with a separate segment or electrode 0,and each have a separate circuit, each including a battery and a primaryof an inductorium, as shown and described in an application filedOctober 21, 1886, Serial No. 216,799; but I prefer to make theelectrodes 0 large enough to have contact with two electrodes E E, asshown in Fig.2, and include each electrode c and its two electrodes E inaprimary, 1, of an inductorium, I, which primary includes a battery.

2, so that separate batteries and iuductoriums' are provided for eachelectrode 0 and its con tacting electrodes E E, thesecondaries 3 of allthe inductoriums being connected with the line.

What I claim is- 1. A telephonic transmitter having a diaph'ragm, a diskin contact with the diaphragm, electrodes in contact with said disk,spring devices for said disk and electrodes, and separate battery andinductoriums for separate contacting electrodes, substantially as set goforth.

2. A telephonic transmitter having a diaphragm, a disk in contact withthe diaphragm,

a group of segmental electrodes on said disk, electrodes in contact withthe segmental electrodes, contact pressure devices for said disk and forsaid electrodes, separate inductoriums and batteries for each group ofcontacting electrodes, and a line-circuit common to the secondaries ofall the inductoriums, substan- IOO tially as set forth.

3. In a telephonic transmitter, the combination of a diaphragm, a diskin contact with In testimony whereof I affix my signaturein thediaphragm and having a group of sepapresence of two witnesses.

rate electrodes, 0, each having two or a numher of contactingelectrodes, EE, and separate JAMES BONTA' inductoriums and batteries foreach electrode \Vitnesses:

c and its contacting electrodes, substantially S. J. VAN STAVOREN,

as set forth. J. DANIEL EBY.

